Worked on improving backend reliability in the dataelement/bisheng repository by addressing a bug that prevented chat sessions from being deleted. Migrated the database session handling from a synchronous to an asynchronous approach using Python, which ensured that delete operations completed reliably and eliminated the risk of orphaned or failed deletions. Focused on asynchronous programming and database management to enhance system resilience and maintainability. This change reduced support incidents related to failed chat deletions and improved overall data integrity. The work demonstrated a methodical approach to backend development, prioritizing robust session handling and a better user experience through technical refinement.